Microsoft are said to be treating this security threat very seriously and working hard to patch the problem, however they are keen to state that the only browser version of theirs that has been exploited is Internet Explorer 6.

Usually Microsoft release updates consistently at certain times, however it is thought that this update is so important that they will be releasing it out-of-band.

If you are unsure as to how to upgrade from Internet Explorer 6 check out this post, if you would like to fond out more check out BBC News.